Compression question
2nd Gear Member
Joined: Jul 2006
Posts: 421
From: arizona
my 70 302 has 180 in each cylinder. you need a valve job. that will even the compression out. i had harden seats put in mine, because its a 70 engine and id already burnt one valve and seat. ive put over 60,000 miles since the valve job and it still doesnt burn a drop of oil.
3rd Gear Member
Joined: Oct 2007
Posts: 584
From: Illinois
No he doesn't "NEED" a valve job. His newest readings are fine for a stock engine. He wanted to see if the bottom end is in good enough shape for some modifications he is planning and I would say it is good enough. If those modifications weren't already planned, I would say just leave it alone and drive it.
To OP - If it were my engine I would do the following just before breaking it down to do heads, intake, whatever you have planned. Warm the engine up real good and then remove the air cleaner. Next, get a pump spray bottle and fill it with water. With the engine running, spray water into the carburetor throats. The water will travel into the engine where it will become steam and thereby steam clean the cylinders, pistons, valves, and combustion chamber. You will see all of this coming out the tail pipe but don't be concerned. I try to spray fast enough that the engine begins to stumble, and keep spraying for a minute or so. You can also use Sea-foam for this. I usually do water and then follow up with sea foam. You can also do this through a vacuum port, but is not necessary on an old carbureted engine like our Mustangs have. If you do this simple treatment, the inside of the engine will be nice and clean when you pop the heads off. BTW sea foam has a video of their treatment here
To OP - If it were my engine I would do the following just before breaking it down to do heads, intake, whatever you have planned. Warm the engine up real good and then remove the air cleaner. Next, get a pump spray bottle and fill it with water. With the engine running, spray water into the carburetor throats. The water will travel into the engine where it will become steam and thereby steam clean the cylinders, pistons, valves, and combustion chamber. You will see all of this coming out the tail pipe but don't be concerned. I try to spray fast enough that the engine begins to stumble, and keep spraying for a minute or so. You can also use Sea-foam for this. I usually do water and then follow up with sea foam. You can also do this through a vacuum port, but is not necessary on an old carbureted engine like our Mustangs have. If you do this simple treatment, the inside of the engine will be nice and clean when you pop the heads off. BTW sea foam has a video of their treatment here
Thread Starter
Joined: Dec 2009
Posts: 11
From: Arkansas
No he doesn't "NEED" a valve job. His newest readings are fine for a stock engine. He wanted to see if the bottom end is in good enough shape for some modifications he is planning and I would say it is good enough. If those modifications weren't already planned, I would say just leave it alone and drive it.
To OP - If it were my engine I would do the following just before breaking it down to do heads, intake, whatever you have planned. Warm the engine up real good and then remove the air cleaner. Next, get a pump spray bottle and fill it with water. With the engine running, spray water into the carburetor throats. The water will travel into the engine where it will become steam and thereby steam clean the cylinders, pistons, valves, and combustion chamber. You will see all of this coming out the tail pipe but don't be concerned. I try to spray fast enough that the engine begins to stumble, and keep spraying for a minute or so. You can also use Sea-foam for this. I usually do water and then follow up with sea foam. You can also do this through a vacuum port, but is not necessary on an old carbureted engine like our Mustangs have. If you do this simple treatment, the inside of the engine will be nice and clean when you pop the heads off. BTW sea foam has a video of their treatment here
To OP - If it were my engine I would do the following just before breaking it down to do heads, intake, whatever you have planned. Warm the engine up real good and then remove the air cleaner. Next, get a pump spray bottle and fill it with water. With the engine running, spray water into the carburetor throats. The water will travel into the engine where it will become steam and thereby steam clean the cylinders, pistons, valves, and combustion chamber. You will see all of this coming out the tail pipe but don't be concerned. I try to spray fast enough that the engine begins to stumble, and keep spraying for a minute or so. You can also use Sea-foam for this. I usually do water and then follow up with sea foam. You can also do this through a vacuum port, but is not necessary on an old carbureted engine like our Mustangs have. If you do this simple treatment, the inside of the engine will be nice and clean when you pop the heads off. BTW sea foam has a video of their treatment here
so does anyone have a cam suggestion?
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